In a major medical milestone, Transit Police Officer Richard “Dic” Donohue has now moved to the Spaulding Rehabilitation Hospital in Boston, 28 days after he was rushed, nearly lifeless, to Mount Auburn Hospital in Cambridge.

Donohue was shot in Watertown on April 19 as he and other police officers faced off against Boston Marathon bombing suspects Tamerlan and Dzhokhar Tsarnaev. The showdown ended with Tamerlan mortally wounded when shot by police and run over by his brother as he fled the scene in a car.

When Donohue arrived at Mount Auburn, he had lost a significant amount of blood, and barely had a pulse, authorities said. But hospital medical staff stabilized and revived him, setting the stage for what his wife, Kim, called “Phase 2’’ of his recovery.

“GOOOOOOD MORNING SPAULDING REHAB! We are now on to ‘Phase 2’ - working out those legs to get him in shape to go home,’’ Kim Donohue posted. “Take the most beautiful rehab facility you can imagine and add in a water view of the Boston skyline, and that is Spaulding-Charlestown.’’

She added that her husband is now going to face extensive physical therapy at the Spaulding, which opened its new facility on the Charlestown waterfront last month.

“It’s time to wake up and smell the PT! We hear the Physical Therapists kick butt first and take names later,’’ Kim Donohue wrote.